Born in Hayle, Cornwall, May 27, 1939, to a working-class family, Rescorla joined the British Army in 1957, serving three years in Cyprus. Still eager for adventure, after army service, Rescorla enlisted in the Northern Rhodesia Police.

Ultimately finding few prospects for advancement in Britain or her few remaining colonies, Rescorla moved to the United States, and joined the US Army in 1963. After graduating from Officers’ Candidate School at Fort Benning, Georgia in 1964, he was assigned as a platoon leader to Bravo Company of the 2nd Battalion, 7th Cavalry, Third Brigade of the 1st Cavalry Division (Airmobile). Rescorla’s serious approach to training and his commitment to excellence led to his men to apply to him the nickname “Hard Corps.”